chore: add issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- Please try the latest release before filing a bug report -->
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. 
+2. 
+
+**Configuration**
+Configuration used to reproduce the behavior:
+
+**Logs**
+<!-- Please upload full client and server logs if possible, with sensitive information masked.
+If you encountered a panic, please re-run with `RUST_BACKTRACE=1` to provide the backtrace. -->
+
+**Environment:**
+ - OS: <!-- Please fill in distribution if you're using linux-->
+- `rathole --version` output: 
+- CPU architecture: